---
cve: "CVE-2026-74705"
severity: "CRITICAL"
cvss: 10.0
epss: "0.5%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-22 16:16:45"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T08:48:37+02:00"
---

# CVE-2026-74705

> 10.0 CRITICAL

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.265
- Kernel ≥ 5.15.216
- Kernel ≥ 6.1.183
- Kernel ≥ 6.6.152
- Kernel ≥ 6.12.104
- Kernel ≥ 6.18.45
- Kernel ≥ 7.1.9

## Referenzen

- <https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87>
- <https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f>
- <https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442>
- <https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55>
- <https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b>
- <https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe>
- <https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d>
- <https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74705) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_